Two-stage valve



W. H. GILLE TWO-STAGE VALVE Feb. 4, 1936.

5 Sheets-Sheet l Filed Nov. 11, 1933 FIG. 1.

gmentoe WILLIS H. GILLE w/z 1% W dbtomq W. H. GILLE TWO-STAGE VALVE Feb. 4, 1936.

Filed Nov. 11, 1933 5 Sheets-Sheet 2 gwmntoc WILLIS H,G|LL'E Illilllllli Feb. 4, 1936. w. H. GILLE 2,029,615

TWO STAGE VALVE Filed Nov. 11, 1953 5 Sheets-Sheet I5 L lllllllllll lllllllllll llllllll I "Hill I IHIII IIII lllllllllllll l I ll lllllll IIHIIIIIII WILLIS H.GILLE Patented F eb- 4, 1936 UNITED STATES TWO-STAGE VALVE Willis H. Gille, St. Paul, Minn., assignor to Minneapolis-Honeywell Regulator Company, Minneapolis, Minn, a corporation of Delaware Application November 11, 1933, Serial No. 697,685

18 Claims.

The present invention relates to the automatic positioning of an element such as a fiuid flow controlling element in response to changes in a condition or the changes in position of a movable member. Specifically, the invention relates to the automatic positioning of a fuel flow controlling valve in accordance with the demands for heat.

In controlling the flow of fuel, such as gas, to a burner, it is often desirable to furnish a relatively large initial flow so as to obtain proper ignition and to then automatically reduce the flow to the desired point. If the fiow of gas were established initially at the desired rate and if the 5 rate should be relatively small, there is extreme danger of improper ignition, such as a pop-back and burning in the mixer in the case of a gas burner. Therefore, the desirability of first supplying a larger flow of fuel to the burner to insure proper ignition.

One of the objects of the present invention is the provision of mechanism for controlling a single fuel controlling valve in such manner that in moving from a closed position the valve first opens relatively'widely and then returns to a more nearly closed position whereby a large flow of fuel is first obtained for proper ignition and thereafter the flow of fuel is reduced to the desired point.

A further object of the invention is the provision of controlling mechanism for controlling the flow of fuel to a burner, either by a single valve or by a plurality of valves; in such manner that on an initial low demand for fuel a large flow is initially established and thereafter the flow is automatically reduced to the desired value, together with means for maintaining the reduced flow until the demand is appreciably lower than that at which the flow of fuel was initially established. a

A further object of theinvention is the provision of a control mechanism for controlling the flow of fuel to a burner in response to the movements of a movable member, the arrangement being such that a large initial flow is first estabiished for proper ignition and is thereafter automatically reduced when the movable member reaches a first point during motion in one direction and maintaining the reduced flow upon return movement of the movable member until nism including starting and holding switches in control of electrically actuated means for establishing a large flow initially and thereafter automatically reducing the flow upon closing of said starting switch and maintaining thissmaller flow by said holding switch, at least one of said switches being controlled in accordance with the demand for heat.

Further objects of the invention include the combination of the above systems with means for again establishing a large flow of fuel to the burner upon an increase in the demand for heat.

Briefly, the specific mechanism to be hereinafter described in detail comprises a single valve which is moved to substantially full open position by a-rotary electrical motor upon a small demand for heat, the motor being deenergized when the valve has reached substantially full open position. The valve thereupon returns toward closed position but is latched in an intermediate position by the energization of an electromagnet. If the demand for heat is thus satisfied, the electromagnet is deenergized and the valve moves to closed position but if the demand for heat increases, the motor is againenergized to completely open the valve and the valve is maintained in open position by stalling of the motor.

Other objects of the invention include the specific combination of elements by which these operations are obtained.

Other objects of the invention include the provision ofmeans whereby the flow controlling mechanism may be manually operated to permit flow of fuel to the burner upon the occurrence of a power failure, together with means for returning the apparatus to automatic control upon the resumption of power.

Further-objects of the invention will become apparent from the detailed description of the invention, the accompanying drawings and the appended claims.

In the drawings,

Fig. 1 is a side view of a valve provided with my novel controlling mechanism, parts being broken away and the cover. being removed to show the details thereof more clearly,

Fig. 2 is a top view of the mechanism of Fig. 1,

Fig. 3 is a schematic wiring diagram showing the various switches and cams in the positions they assume when the valve is closed and there is no demand for heat,

Fig. 4 is a similar view of the cams and switching mechanism showing their positions when the valve has been moved toward open position on an initial call for heat,

Fig. 5 is a similar view showing the motor controlling switch moved to open position as a result of the valve having been moved to substantially full open position,

Fig. 6 is a similar view showing the valve returned to half-open position and maintained therein by the energization of the electromagnet, and v Fig. 7 is a further view of the valve switching mechanism and cams in the positions they assume when the valve has been moved to full open position and is being maintained therein by stalling of the motor upon a larger demand for heat.

Referring first to Figs. 1 and 2 of the drawings, the invention as herein illustrated comprises a valve casing ill having outlet and inlet ports in and i2 respectively, and a partition l3 therebe: tween which is provided with a valve opening it. An opening 3 provided in casing l3 maybe utilized to supply a pilot light if desired. The valve casing 5,0 is further provided with a vertically extending cylindrical portion 55 that is provided with screw threads on its outer surface. A cupshaped member 86 has a large disc it and a smaller disc l8 secured to its under side by any suitable means such as the rivets l9. A bonnet 20 engages disc ii and cooperates with the screw threads formed on extension l3 to clamp cup member l6 and discs El and 03 to valve casing it. A sealing gasket 2! is preferably interposed between cylindrical extension l3 and disc ll to prevent the escape of gas or other fluid flowing through the valve casing iii. A guide bushing 22 for a valve stem 23 passes through cup member 56 and discs H and i3 and is preferably secured to cup m ember it by having its end peened over. The upper portion of valve stem 23 is threaded and has a pair of diaphragm clamping discs 23 threaded thereon. A diaphragm 23 is clamped between disc Zl and a nut 23 threaded on valve stem 23 engages the upper diaphragm clamping disc 23 to help retain it in its proper position. Diaphragm 25 acts as a sealing-ofi diaphragm to prevent the escape of gas from valve casing l2 to the atmosphere and is clamped between a circular base plate 2? and cup member i3 by means of screws and nuts 23.

A screw 29 first receives a washer 33 then a valve disc 3! and a valve disc retainer 32 which 'pin 33 which passes through valve stem 23 and screw 29. A coil spring 33'has its upper end abutting disc l8 and its lower end abutting a spring retainer 37 which is slidably received on valve stem 23 and has its downward motion limited by a washer 33 that engages a circumferential groove formed in valve stem 23. In this manner valve disc 3| is constantly biased to close valve opening it by coil spring 36.

. Base plate 2'! has a pair of plates 33 and #50 secured thereto which support the various operating mechanisms for moving valve disc 3! away from valve opening It against the bias of coil spring 36. A lever M is pivoted on a shaft 32 which is journalled in plates .33 and 53. A U- shaped member 33 is loosely, pivoted to lever M as indicated at M and loosely receives the upper end of valve rod 23 which is supplied with a nut 45 whereby clockwise rotation of lever l! about its pivot causes valve disc 35 to be raised against the bias of coil spring 36. V

Lever ll is actuated by a link 66 which has one of its ends pivoted'near the left' hand end of link ll as indicated by the pin 37. The upper end of link 46 is provided with a hook 38 which is adapted to be engaged by a crank pin 39 that is carried by a large gear 50. The large gear 50 l is secured to a shaft 5| which is in turn journalled in plates 39 and tit. A spring 52 is wound about a pin 53 carried by lever M and extends around pin 6? and link it to bias the upper end of link 36 into engagement with the hub 53 of large gear 33.

Gear 50 meshes with a pinion 53 which is integral with a. gear 53 and this pinion and gear assembly is secured to a shaft 57 journalled in plates 39 and lil. A similar pinion 58 meshes with gear 56 and is integral with a gear 53. This gear 7 Upon energization of the field winding" 65 of I motor 65, gear 59 is driven at reduced speed in a clockwise direction (as viewed in Fig. l) and after a partial rotation of gear 33 the crank pin 33 carried thereby engages the hooked end 63 of other means (to be hereinafter described) operate" to maintain the valve disc M in its raised position. It should be noted that crank pin 33 and i the hook 38 form a one way connection whereby crank pin 33 may continue rotating in counterclockwise direction after the valve has been fully closed by coiled spring 36.

The mechanism thus far described is not new with the present inventor and is merely exemplary of one type of mechanism to which the instant invention may be applied. The novel switching mechanism and other elements by which the novel features of the instant invention are obtained will now be described.

The rotor shaft 32ccarries a stop member 66 x which is secured to rotor shaft 62- and is normally unimpeded in its rotary movement. However, under certain conditions, the extended end 37 of an armature 6B is adapted to be moved into the path of rotation of stop member 63 to prevent,

rotation of rotorshaft 62 and the various gears and pinions connected thereto. The armature G8 is pivoted on a pin 69 which is mounted in plates 39 and t0 and is normally biased into engagement with a stop pin it by means of a spring H. An electromagnet 12 of usual construction is mounted between plates 39 and tliand is adapted, upon energization, to attract armature 68 against the bias of spring H. suchrattraction of armature 68 moves the extended end 61 thereof into the path of rotation of stop member 66 for the purpose hereinbefore pointed out.

A reduced portion of shaft 5! extends forwardly from plate 33 for an appreciable distance and has mounted thereon arear cam 13 and a front cam 76. A bushing "35 is interposed between rear cam I3 and the shoulder formed in shaft by the reduced portion thereof. A similar bushing I6 is placed between cams I3 and I4. Another similar bushing 11 is placed in front of cam I4. A coiled spring 18 bears against bushing 11 and is compressed by a washer I9 which is held on shaft 5| by means of a pin 88. In this manner, the rear and front cams I3 and I4 are friction ally coupled to shaft 5| whereby they rotate therewith when free to do so but may remain stationary or move in opposition to the shaft 5I when necessary.

The rear cam I3 is provided with a hooked extension 8| which cooperates with a stop pin 82 carried by plate 48 whereby the clockwise rotation of rear cam I3 is limited. A relatively stifi switch arm 83 carries a contact 84 which is adapted to cooperate with a contact 85 carried by a relatively flexible switch arm 85. Switch arms 83 and 86 are suitably carried by plate 48 through the necessary insulating means (not shown) the arrangement being such that contact 85 is normally disengaged from contact 84 but is adapted to be moved into engagement therewith by a stop 81 formed on cam I3. Upon counter-clockwise rotation of cam I3, stop 81 engages switch arm 86 and moves contact 85 into engagement with contact 84. Thereafter therelatively stiff switch arm 83 prevents further counterclockwise rotation of rear cam I3 and thereby acts as a stop. This rear cam is also provided with a notch 88, a dwell 89, an inclined surface 98, a dwell 9| and a dwell 97.

The front cam I4 is provided with stops 92 and 93 which cooperate with stop pin 82 to respectively limit counter-clockwise and clockwise rotation of cam I4. Cam I4 is also provided with a notch 94, a dwell 95, a dwell 96 and an inclined surface 98.

Rear cam I3 is engaged by a cam follower I88 which is pivoted at I8I and carries a flexible blade I82 to the free end of which is secured a contact I83. Contact I83 cooperates with a contact I84 carried by a relatively stationary switch arm I85. Both cams I3 and I4 conjointly control the movements of a cam follower I86 which is likewise pivoted at I8I and carries a flexible blade I8I. Blade I8I supports a pair of contacts I88 and I89 which respectively cooperate with contacts H8 and III carried by a bracket II2.' It will be understood that these various cam followers and switch arms are suitably mounted upon plate 48 through appropriate insulating means.

. A block of insulating material H5 is mounted between plates 39 and 48 and is pivoted concentrically with shaft 5|. This block of insulating material 5 supports a stationary contact II 6 and a flexible blade I II which carries a cooperating contact II8. Blade III is adapted to be engaged by the end of crank pin 49 whenever the same is rotated in either direction to a point wherein the link 46 has moved the valve disc 3| to a substantially half open position when the parts are in the position shown but block II5 may be adjusted so that contacts H6 and H8 are closed at other positions of valve disc 3|.

A link H9 is pivoted to plate 48, as indicated at I28, and carries a cam operating arm I2I which is adapted to engage the stop extension 8| of cam I3 under certain conditions. The link H9 is actuated by a link I22 which is connected to pin 53 and therefore moves in accordance with the movements of valve disc 3|.

A manually operable pin I23 is journalled in plate 48 and a bearing 99 carried thereby and is normally biased to the position shown in Fig. 2 by means of a spring I24. The inner end of pin I23 is provided with an enlargement I25 which normally bears against the extended end of bearing 99 under the bias of the spring I24. If the extended end of lever 4| be manually depressed, inward movement of pin I23 will cause its enlarged end I25 to move under the opposite raised end of lever 4| to maintain the same in its raised position. The enlargement I25 will bear against the rear'face of lever 4| whereby the pin I23 cannot be returned to its normal position by the coiled spring I24. In this manner, the valve disc 3| may be moved to a partial open position and latched therein. The pin I23 has another enlargement I 25 which upon manual inward movement of pin I23 operates to close a recycling switch generally indicated at I21.

The'valve of the present invention is adapted to be operated by any movable member or condition responsive device such as the room thermostat generally indicated at I 28. This room thermostat comprises a coiled bimetallic element I29, having one of its ends secured, and operating blades I38, I3I and I32. Upon a fall in the temperature to which bimetallic element I28 responds, blade I38 first engages a contact I33. On continued temperature fall, blade I39 flexes and blade I3I engages a contact I34.

Upon a still further temperature'fall, blades I38 structions may be included in the control circuit to be hereinafter described, if desired.

Operation Referring now particularly to Figs. 3 to 7 inclusive of the drawings, the operation of the valve apparatus will now be described. Fig. 3 shows a schematic wiring diagram of the entire system with the various switches and cams in the positions which they assume when the valve is closed, it being noted that switches I83|84, I89III and. IIS-I I8 are all open whereas switches I88-III! and 3485 are closed, the latter by virtue of stop 81 of cam I3. Stop 92 of earn I4 is in engagement with pin 82. Also all of the thermostat blades are disengaged from their respective contacts.

Now, if the temperature torwhich bimetallic element I29 responds lowers so as to bring blade I38 into engagement with contact I 33, and then bring blade I3I into engagement with contact 34, an energizing circuit for field winding 65 of motor 54 will be established as follows: secondary I36. wire I39, safety pilot 99, wire I48, wire I4I, contact l33, blade I38. blade I3I, contact I34, wire I42 contact II8, contact I88. blade I81, wire I43, wire I44, field winding '65, wire I45 and wire I46 to the other side of secondary I36. Energization of field winding 65 rotates shaft 5| and gear 58 in clockwise direction as viewed in Fig. 1 to first take up the lost motion between crank pin 49 andhook 48. During this rotation of shaft 5|, cams I3 and I4 are also rotated in a clockwise direction. Initial rotation of these cams causes cam follower EDI! to ride up inclined cam surface 90 of rear cam 73 to move contact I83 into engagement with contact 604 whereby a holding circuit for field winding 65, independent'of blade I 3! and contact H33 and contacts I08 and HILis established as follows: secondary I36, wire I39, safety pilot 99, wire I30, wire MI, contact I33, blade I30, bimetallic element M9, wire I 41, wire I68, contacts I03 and I03, flexible blade I02, wire H53, wire M l, field winding 65, wire I t5 and wire I66 to the other side of secondary I36. This initial movement of cams i3 and M also moves stop 3! from engagement with flexible switch arm 86 whereupon contacts 83 and 85 separate.

During this initial movement of gear 53 and shaft 35, crank pin 39 has approached the hooked end -88 of link 36 and after the above described holding circuit has been established the crank pin 49 begins toraise link 36 to open the valve. Rear cam l3 only moves a relatively short distance until stop extension 8i engages stop pin 82 and thereafter further movement of cam E3 in a. clockwise direction is prevented. after contacts i103 and 113. 5 have been closed by 98 of cam Hi and on to dwell Qlof cam 73 with the result that contact W8 moves out of engagement with contact lit to open the initial energizing circuit for field winding M5. However, contact H09 does not move into engagement with contact Ml.

When the valve has been moved to its half open position, crank pin 39 closes contacts H8 and H8 but it will be noted that these contacts are in series with contacts 86 and 83 which were initially closed but were immediately opened. Therefore, this closure of contacts H6 and M8 at this time does not complete any circuits. As

the shaft 5| continues to rotate, cam i l will ro- 1 tate in unison therewith and the notch 93 there of will pass under cam follower 536. However, cam follower M36 is prevented from moving into notch 9t by reason of its resting upon the 'surface 91 of cam'73.

Thus, when the valve has reached a position in which it is practically completely open, the various cams and switches will assume the position showndn Fig. 4 wherein switches 3l85,

I will ride down inclined surface 33 of cam 73 and onto dwell 9| thereof ,with the result that contact I03 will move out of engagement with contact I041 to break the holding circuit previously described whereupon complete deenergization of field winding 65 of motor 36 takes place. During this reverse rotation'of cam 73, cam follower I06 rests upon surface 35 of cam ll and the notch 88 of cam 73 assumes a position substantially directly under cam follower M36. This position of,

the parts is shown by Fig. 5.

Deenergization of field winding 63 allows the various parts to be rotated in counter-clockwise direction under the bias of coiled spring 36 and the valve moves towardsclosed position. During this initial movement towards closed position, cam follower mt rides 0d of surface 9 3 of cam Shortly aoaaeia it after it has passed over notch 88 in cam I3 and rides upon dwell 83 of cam 33 so that contacts 838 and I39 are still maintained out of en gagement with contacts H0 and Hirespectively. A relatively small counter-clockwise movement of cam 13 brings its stop 8 into engagement with flexible switch arm;86 so that contact 85 is again moved into engagement with contact 83. As the valve continues to'close, and reaches half open position, crank pin 59 will again engage flexible switch arm ill to move contact H8 into engagement with contact 9 It and at this instant an en- -ergizing circuit for the coil of relay i2 is closed as follows: secondary B33, wire E39, safety pilot 39, wire ildwire Mil, contact I33, blade H30, wire I61, wire M3, switch arm 83, contacts 844 and 85, switch arm 86, wire I53, contact H6, contact M8, wire Hi, the coil of relay 12, wire H52, and

wire M6 to the other side of secondary 33. The

" armature S3 of relay i2 is thereupon attracted and the extended end 67! moves into the path of movement'ofstop member 66 whereupon further rotation of rotor shaft 32 is prevented with the result that the valve is held in half open position andthe cams l3 and It assume the position shown in Fig. 6. It will be noted that this energizing circuit for the coil of relay i2 is independent of blade l3! and contact E33.

If the temperature to which thermostatic element I29 now responds should rise so as to separate both of blades l3! and [30 from their contacts I33 and 533, then the circuit through the coil of relay l2 and all other circuits will be broken and the valve will return to its closed position. During such closing movement, the vari-, ous cams and switches will return to the positions -shown in'Fig. 3.

From the foregoing description of this phase of the operation of the present invention, it will be apparent that the valve is initially opened relatively widely and automatically returns to and is maintained in an intermediate position as the result of a small demand for heat. It will further be noted that the demand for heat must decrease substantially before the valve will return to closed position. The switch constituted by blade I3I and contact 935 might be termed a starting switch and the switch constituted by blade I30 and contact B33 might be defined as a holding switch. It will be nOted' that the holding switch is closed first and then the starting switch is closed upon an increase in the demand for heat.

Assuming however that the temperature continues to fall so that blade m2 is brought into engagement with contact I35, then an energizing circuit for field winding 63 will be established as follows: secondary I36, wire I39, safety pilot 99, wire Hi0, wire MI, contact i33, blade I30, blade E32, contact I35, wire E53, wire Md, field winding 35, wire I33 and wire I33 to secondary B36. Energization of field winding 65 causes the motor 65 to begin to move the valve from its half open position to its full open position. This rotation is possible even though the relay 32 is energized inasmuch as the inclined surface I53 of stop member 66 will ride under andlift the extended end 67 of armature tit-against the pull of electromagnet E2. The resulting initial rotation of cams i3 and it in a clockwise direction bpenscontacts 33 and 85 by reason of stop 81 and cam 73 moving out of engagement with flexible switch arm 86. The coil of relay 12 is thereupon deenergized. This rotation of cams l3 and I4 allows cam follower I06 to drop in notches 88 and 94 whereupon contact 1P9 moves into engagement with contact 7 2,029,615 I I I- whereby a holding circuit through blade I 3| and contact I34 is established for field winding 65 as follows: secondary I36, wire I39, safety pilot 9, wire I40, wire I4I, contact I33, blade I30, blade I 3I, contact I 34, wire I42, bracket II2, contact III, contact I09, flexible blade I01, wire I43, wire I44, field winding 65, wire I45, and wire I46 to the other side of secondary I36. Engagement of cam follower I06 with notches 88 and 94 prevents further clockwise movement of cams I3 and I4 so that cam follower I does not ride up' surface 90 of cam I3 sufficiently to close contacts I03 and I04. When the valve has moved to full open position, the motor 64 stalls and the valve is thereby maintained in full open position, it being noted that this circuit for motor field winding 65 traverses blade I3I and contact I34 whereby the motor field 65 will remain energized and the valve will be maintained in its full open position until the temperature rises sufiiciently to move blade I3I from engagement with contact I 34.

When this happens, the parts will return to the position shown in Fig. 6 wherein the valve is half open and may again be fully opened if the temperature should again drop to cause blade I32 to engage contact I35 or may be completely closed if the temperature should rise sufficiently to disengage all three blades I30, I3I and I32 from contacts I33, I34 and I 35. It will be noted that the switch I32--I35 acts as a starting switch and the switch I3I-I34 acts as a holding switch for the wide open position of the valve.

From the foregoing description, it will be seen that upon a first temperature fall with the valve in closed position, the valve opensinitially sub stantially to its full open position and automatically returns to its half open position. Thereafter, the valve may again close or move to full open position depending upon whether the temperature thereafter rises to ahigher' or falls to a still lower point. In the case the temperature falls to a still lower point and the valve completely opens, it will be maintained in full open position until the temperature is partially restored, at which time it will return to half open position. After having again reached half open position, the valve may thereafter completely close or return to full open position in accordance with demands for heat.

It will also be noted that throughout all of these operations, there is an initial energizing circuit which results in the establishment of one or more holding circuits so that in no case after the valve has started to open can it chatter as the result of fluttering of the thermostat contact which started the operation. While these holding circuits have been made to depend upon changes in the temperature to which the thermostat responds, they need not necessarily be so controlled and could well be dependent upon some condition other than further temperature changes to which the actuating thermostat responds.

In the event there should be a failure of electrical power and it is desired to open the valve, the extended, end of lever 4I may be manually depressed and the shaft I23 moved inwardly as previously described to engage the under side of lever 4|. In this manner, the valve is held in partial open position and the recycling switch I2! is moved to closed circuit position. Whenever the electrical power returns, a circuit to field winding 65 is immediately established as follows: secondary I36, wire I39, safety pi1ot99, wire I40, wire I55, recyclirg switch I2'I, wire I56, field winding 65, wire I45 and wire I46 to the other side of secondary I36. The valve is therefore more widely opened and upon movement of lever 4I out of engagement with the enlarged end I25 of pin I23, spring I24 returns pin I23 to the position shown in the drawings whereupon recycling switch I21 moves to open position and the valve is free to return to closed position or any other of its positions in accordance with the demands of the thermostat I28 The extended end of lever 4| may also be utilized to operate a secondary air damper or any other desired mechanism. It will also be understood that a cover completely houses the plates 39 and 40 and the mechanism supported thereby so that the valve mechanism presents a unitary structure the operating parts of which are fully enclosed with the exception that the extended end of lever M and the outer end of pin I23 extend without the cover for the purposes hereinbefore described.

While a specific embodiment of the invention has been herein described, it is to be understood that many changes and modifications could be made therein and particularly that the main control switch need not respond to temperature changes or that it can respond .to temperature changes other than those in the space to be heated without departing from the spirit of the invention. I am therefore to be limited only within the scope of the appended claims.

I claim as my invention:

1. In combination, a singlevalve normally biased to closed position, electrical means for opening said valve maintaining it in open position against its bias, and means in control of said electrical means upon an initial small demand for heat for causing the electrical means to move said valve to a relatively large open position and thereafter automatically allow said valve to return to an intermediate open position and maintain it therein, and manual means for moving the valve to an intermediate open position, releasably latching the valve in such position and for closing a valve opening circuit for the electrical means upon a failure of electrical power, whereby said valve will be opened further upon a resumption of power to release said latching means and return the valve to automatic control.

2. A device of the class described, comprising, in combination, a flow controlling mechanism for controlling the flow of fluid fuel to a burner, a movable member movable along a predetermined path of travel, means associated with said movable member and flow controlling mechanism for operating the latter initially to supply a large flow of fuel to the burner and automatically to decrease the supply of fuel thereto when the movable member reaches one point in its path of travel when moving inone direction, means associated with said movable member and flow controlling mechanism for maintaining said smaller supply of fuel to the burner during return movement of said movable member until the same reaches a second point spaced from said first point, and means associated with said movable member and mechanism for again establishing a large flow of fuel to the burner if said movable member continues movement in said first direction to a third point lying beyond said first point. 3. A device of the class described, comprising, in combination, a single valve for controlling the fiow of fluid fuel to a burner, a movable member movable along a predetermined path of travel, means associated with said movable member and valve for operating the latter initially to supply maximum flow of fuel to the burner and automatically to decrease the supply of fuel to an intermediate flow when the movable member reaches one point in its path of travel in moving in one direction, means associated with said movable member and valve for maintaining said intermediate flow of fuel to the burner during I return movement of said movable member until the same reaches a second point spaced from said first point, and means associated with said movable member and valve for again establishing said maximum fiow offuel to the burner if said movable member continues movement in said first direction to a third point lying beyond said first point.

4. A device of the class described, comprising,

' in combination, a flow controlling mechanism for controlling the flow of fiuid fuel to a burner, a

movable member-movable along a predetermined path of travel, means associated with said movpoint, and means associated with said movable member and flow control mechanism for maintaining said large and small flows of fuel upon return movement of said movable member to points spaced respectively from said second and first points. i

5. A device of the class described, comprising, in combination, a single valve for controlling the flow of fluid fuel to a burner, a movable member movable along a predetermined path of travel, means associated with said movable member and valve for operating-the latter initially to supply maximum fiow off-uel to'the burner and automatically to decrease ,the supply oi? fuel to an intermediate how when the movable member reaches one pointin itsp'ath of travel upon moving in one direction, meansassociated with said movable member and valve foragain establishing said maximum flow of fuel to the burner upon continued movement of said movable member in the same direction to a-second point which Q lies beyond said first point, and means-associated point.

6. In combination, a valve biasedto closed position, and adapted to control the supply of fuel to a burner, electrical valve operating means for opening said valve and maintaining the same open against its bias, a starting switch for energizing at least a portion of said electrical valve operating means to move said valve to an open position, a switch which is-c10sd as a result of energization of said'portion of the valve operating means, a holding circuit for said portion of the valve operating means controlled by said last-named switch and independent of said starting switch, means controlled by the movement of said valve forgoperatively deenergizing said'portion of the valve operating means when said valve reaches a relatively large open position whereby said valve will return towards its closed position aoaaeie under its bias, a switch moved to a new circuit controlling position when said valve reaches an intermediate position, a holding switch independent of said valve movements, and a circuit controlled by the conjoint action of said two lastmentioned switches for energizing another portion of said electrical valve actuating means for maintaining said valve ,in an intermediate position.

'7. A device of. the class described, comprising, in combination, a valve biased to closed position, a movable member, a holding switch and a starting switch sequentially closed thereby, electrical valve controlling means, a circuit controlled by said starting-switch for energizing at least a portion of said electrical valve controlling means to move the valve to an open position against its bias, means controlled by valve movement for operatively deenergizing said portion of the valve controlling means when said valve approaches full open position whereby the same returns toward closed position under the influence of its bias, a switch moved to closed position when said valve reaches an intermediate position, a circuit controlled by said last named switch and holding switch in series for energizing another portion of said electrical valve controlling means to mainmeans controlled by said movable member for moving said valve to and maintaining the same in its maximum open position.

'8. In combination, a valve biased to closed position, a movable member, an electric motor for opening said valve againstits bias, a circuit for said motor controlled by said movable member, whereby said valve may be moved to open position, means for automatically deenergizing said motor when the valve has been moved to open position, a magnetic coil for preventing return movement of said valve, a switch moved to closed position during closing movement of said valve, a circuit for the magnetic coil'controlled by said switch, means formanually opening said valve to an intermediate position and releasably latching the same therein upon the occurrence of a power failure, a recycling switch moved to closed position upon such manual manipulation of the valve, and a circuit for the motor controlled by the recycling switch and independent of the movable member, whereby the valve is opened upon the resumption of power to release the latching means irrespective of the position of the movable member.

9. In combination, a valve biased to closed position, a movable member, first, second and third switches sequentially closed thereby, an electric device for opening said valve and'maincontrolled by said second switch, means operated when said valve has substantially fully opened for deenergizing said device, a circuitwhich is closed when said'valve reaches an intermediate position during closing movement, a second device controlled by said circuit for preventing further closing ofisaid valve, said circuit including said first switch, and a circuit for said first device controlled by said third switch.

10.'-A device of the class described, comprising, in combination, a valve biased to closed position, a movable member, a holding switch and a starting switch sequentially closed thereby, a rotary electricalmotor for opening said valve against its bias, a circuit controlled by said starting switch for energizing said motor to open the valve, means controlled by valve movement for operatively detain said valve in its intermediate position, and a -taining the same open, a circuit for said device 2,029,615 energizing said motor when the valve approaches full open position whereby the same thereupon returns toward closed position under its bias, an electromagnetic coil arranged when energized to prevent closing of the valve, means for closing a circuit for said electro-magnetic coil through said holding. switch when the valve reaches an intermediate position during closing movement, and means controlled by said movable member for moving the valve to and maintaining the same in its maximum open position.

11. A device of the class described, comprising, in combination, a valve biased to closed position, a movable member, a holding switch and a start ing 'switch sequentially closed thereby, a rotary electrical motor for opening said valve against its bias, a circuit controlled by said starting switch for energizing said motor to open the valve, means controlled by valve movement for operatively deenergizing said motor when the valve approaches full open position whereby the same thereupon returns toward closed position under its bias, an electromagnetic coil arranged when energized to prevent closing of the valve,

means for closing a circuit for said electromagnetic coil through said holding switch when the valve reaches an intermediate position during closing movement, and means controlled by said movable member for energizing said motor to open the valve against its bias and for maintaine ing the same open by stalling of the motor.

12. A device of the class described, comprising, in combination, a valve biased to closed position, a movable member, a holding switch and a starting switch sequentially closed thereby, electrical valve controlling means, a control switch controlled by movement of the valve controlling means and arranged to be closed upon initial movement of said valve controlling means in valve opening direction and to be opened when said valve approaches fully opened position, an initial energizing circuit for energizing at least a portion of said electrical valve controlling means to move the valve to an open position against its bias controlled by the starting switch, a holding circuit for said portion of the valve controlling means controlled by the holding switch and said control switch in series, means for interrupting the initial energizing circuit after the holding circuit is established, and a circuit which is completed through the holding switch when the valve reaches an intermediate position during closing movement for energizing another portion of the valve controlling means to maintain the valve in its intermediate position.

13. In combination, a single valve biased to means for opening the valve and maintaining it open, an initial energizing circuit for a portion of the valve controlling means controlled by the second main control switch to open the valve" the first main control switch to prevent further "closing of the valve which circuit is established when the valve reaches an intermediate position during closing movement, and a circuit forthe I first portion of the valve controlling means for completely opening the valve controlled by the third main control switch.

14. In combination, a single valve biased to closed position, first, second, and third main control switches that are sequentially closed in the order named by a single actuator upon movement in one direction, electrical valve controlling means for opening the valve and maintaining it open, an initial energizing circuit for a portion of the valve controlling means controlled by the second maincontrol switch to open the valve against its bias, a holding circuit for said portion of the valve controlling means controlled by the first main control switch, means for deenergizing said portion of the valve controlling means when the valve has been moved to a relatively largeopen position, means for establishing an energizing circuit for another portion of the valve controlling means through the first main control switch to prevent further closing of the valve when the valve reaches an intermediate position during closing movement, a circuit for the first portion of the valve "controlling means for completely opening the valve controlled by the third main control switch, and means for establishing a maintaining circuit for the first portion of the valve controlling means through the second main control switch upon movement of the valve to full open position from said intermediate position for maintaining the valve fully open until opening of the second main control switch.

15. In combination, a valve biased to closed position, a movable member, first, second, and third switches closed thereby in sequence upon movement of the movable member in a single direction a rotary electrical motor for opening the valve against its bias, an initial energizing circuit for the motor controlled by the second switch for opening the valve when the same is closed, means for establishing a holding circuit for the motor through the first switch upon initial movement of the motor in valve opening direction, means for deenergizing the motor when the valve has been moved to a relatively large open position whereupon the valve is moved toward closed position under its bias, an electrical device operative to prevent closing of the valve when energized, means for establishing an energizing circuit for said device through said first switch when the valve reaches an intermediate position during closing movement whereby the valve is maintained in such intermediate position until the first switch opens, and an energizing circuit for the motor to move the valve from said intermediate open position to full open position controlled by the third switch.

16. In combination, a valve biased to closed po sition, a movable member, first, second, and third switches closed thereby in sequence upon movement of the movable member in a single direction a rotary electrical motor for opening the valve against its bias, an initial energizing circuit for the motor controlled by the second switch for opening the valve when the same is closed, means for establishing a holding circuit for the motor through the first switch upon initial move ment of the motor in valve opening direction, means for deenergizing the motor whenthe valve has been moved to a relatively large open position whereby the valve is moved toward closed position under its bias, an electrical device operative to prevent closing of the valve when energized, means for establishing an energizing circuit for said device through said first switch when the valve reaches an intermediate position during closing movement whereby the valve is maintained in such intermediate position until the first switch opens, an energizing circuit for the motor to move aoeaeie a relatively large flow oi fluid whereby the fluid flow controlling mechanism returns towards minimum flow position under its bias, switching mechanism moved to close circuit position when the fluid flow controlling mechanism has reached the valve from said intermediate open position to 5 full open position controlled by the third switch, a position permitting an intermediate flow of a switch moved to closed position when the valve fluid during Such return v men a d a reaches full open position in moving thereto from cuit for energizing another portion of the elecsaid intermediate open position, and a maintaintrical means to maintain the fluid flow controlling ing circuit for the motor controlled by the second mechanism in such intermediate position con- 10 switch and last-named switch in series.- trolled by said switching mechanism and the 17. In combination, fluid flow controlling mechholding switch. anism' normally biased to minimum flow position, 18. In combination, a valve biased to closed electrical means associated therewithfor controlposition, a rotary electrical motor for moving ling the operation thereof, a normally open the valve to open position, against its loias,' a 15 switch that is closed upon initial energization "normally open switch arranged to be closed upon of the electrical means, anormally closed switch initial operation of the motor in valve opening that is opened after closure of the normally open direction, a normally closed switch arranged to switch upon energization of the electrical means, he opened after the normally open switch is holding and starting switches, a main actuator clos d, holdi g a d Sta Sw aninitial 20 Y arranged to close the holding and starting energizing, circuit for the motor controlled by switches sequentially in the order named upon the starting swi ch a d normally closed switch, movement of the actuator in one direction, a cira holding circuit for the motor completed through cuit controlled by the starting switch and northe holding switch upon closure of the normally mally closed switch for energizing a portion of open switch, means for operatively deenergizing 25 the electrical means to move the fluid flow cone or wh th a v pp full p trolling mechanism toward maximurn flow posiposition whereby the valve is=moved towards tion, a holding circuit for energizing said portion closed position by its bias, a circuit which is comof the electrical means completed by the holding pleted when the valve reaches an intermediate switch and normally open switch upon closure position during closing movement, an electrical 30 of the normally open switch whereby said portion device in said circuit, and connections between of the electrical means is maintained energized said device-and valve by which the device preafter opening of the normally closed switch, vents further closing of the valve when the de- 1" means for operatively deenergizing said portion vice is energized. 5 of the electrical means when thefiuid flow con- WILLIS H. GILLE.

trolling mechanism reaches a position permitting CERTIFICATE or cocr oii;

Patent No. 2,029,615.. artery a, less.

WILLIS Hi GILLE V It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 7, second column, line 71, claim '16, for, "whereby" read whereupongand that the said Letters Patent should be read with this correction therein that the same may,

conform to the record of the case in the Patent Office.

Signed and sealed this 14th ,d ril, A. ofieee Leslie Frager 5 Acting Commissioner of Patents, 

